← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 396 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.89² =
  2. 2.19² =
  3. 3.61² =
  4. 4.71² =
  5. 5.81² =
  6. 6.21² =
  7. 7.21² =
  8. 8.19² =
  9. 9.19² =
  10. 10.59² =
  11. 11.19² =
  12. 12.91² =
  13. 13.21² =
  14. 14.59² =
  15. 15.79² =
  16. 16.59² =
  17. 17.91² =
  18. 18.21² =
  19. 19.89² =
  20. 20.49² =
  21. 21.21² =
  22. 22.71² =
  23. 23.91² =
  24. 24.79² =
  25. 25.51² =
  26. 26.31² =
  27. 27.19² =
  28. 28.91² =
  29. 29.51² =
  30. 30.91² =
  31. 31.79² =
  32. 32.51² =
  33. 33.41² =
  34. 34.29² =
  35. 35.61² =
  36. 36.69² =
  37. 37.29² =
  38. 38.59² =
  39. 39.41² =
  40. 40.29² =

Answer key

  1. 7921
  2. 361
  3. 3721
  4. 5041
  5. 6561
  6. 441
  7. 441
  8. 361
  9. 361
  10. 3481
  11. 361
  12. 8281
  13. 441
  14. 3481
  15. 6241
  16. 3481
  17. 8281
  18. 441
  19. 7921
  20. 2401
  21. 441
  22. 5041
  23. 8281
  24. 6241
  25. 2601
  26. 961
  27. 361
  28. 8281
  29. 2601
  30. 8281
  31. 6241
  32. 2601
  33. 1681
  34. 841
  35. 3721
  36. 4761
  37. 841
  38. 3481
  39. 1681
  40. 841

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths